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G. M. HATHAWAY.

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* Untrnn STATES PATENT FFICEO GEORGE M. HATHAWAY, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF TO JOHN L. HUBBARD.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 250,662, dated December 13, 1881.

Application filed February 2, 1881.

To all whom it may concern Be it known that I, Gnonen M. HATHAWAY, a citizen of the United States, residing at New York,in the county of New York and State of New York, have invented certain new and useful Improvements in Attaching Knobs to Spindles; andI do hereby declare thefollowin gto be a full, clear, and exact description of the invention, such as will enable others skilled in IO the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to a new and improved device for attaching door-knobs to spindles; and the novelty consists in the construction and arrangement of parts, as will be more fully hereinafter set forth, and specifically pointed. out in the claim.

The object of the invention is to provide an ornamental knob of porcelain, bronze, or similar material, to secure said knob removably to the adjacent parts, and to secure the spindie, rose, and knob, when used upon doors or for mortise or rim locks, together in such a manner that they may be readily removed or replaced at will.

In carrying out my invention I employ for 50 doors and locks the ordinary knob and spindle rigidly secured together. The spindle passes through a metal rose, which is, or may be, secured to the door. A recess is made in this rose, which receives a shank having a rectan- 5 gular longitudinal central opening, three sides of which are upon a parallel plane, and a fourth side inclined. An annular portion of this shank, if a porcelain knob is used, furnishes a seat or bearing for a corresponding surface upon the porcelain knob, the shank being secured to the knob in the usual manner. The knob is provided with a central aperture, properly countersunk to receive the head of a screw, the threaded portion of which operates within a 4 5 threaded aperture in a transverse arm upon a wedge-key, the inclined side of which corresponds with the incline upon one side of the rectangular longitudinal opening in the shank. It will be observed that by this construction the wedge not only binds the spindle in the (No model.)

said shank, but that the action of the screw also holds the porcelain knob firmly upon its seat, and it is thus prevented from being pulled off, which frequently occurs from constant use.

In the accompanying drawings, Figure 1 represents a central vertical section, and Figs. 2 and 3 detail views, of my improved device.

Referring to the drawings, the letter A indicates the spindle, and B the rose, having annnlarrecessb. Cindicatesthemetalshank,having longitudinal aperture with inclined side 0, and annular portion 0, having seat or bearingsnrface 0 for a corresponding portion, 61, upon a porcelain knob, D, having a central countersunk aperture, as shown at d. This aperture (1 receives the head of a screw, E, the threaded portion of which operates in a threaded aperture,f, in a transverse arm, F, of a wedge, F, the inclined side of which corresponds with the incline in the shank O.

To place the knob in position the spindle is passed into shank O, the wedge being loose. The screw is then introduced, and by turning it the wedge is drawn up and the spindle firmly fixed and held in position, and at the same time the porcelain knob is held firmly to its seat.

I am aware that an arm having a lo g adapted to fit in a semicircular recess in the spindle, and having a threaded cap adapted to receive a screw which holds the knob in place, has been before used; but the holding-bearing in such case is limited and abrupt, while in my device it bears equally the entire length of the knob-shank upon the spindle. 8

Broadly, I am aware that wedges are not new with me for this purpose, as such a device is shown in English Patent No. 1,490 of 1878; but the construction there shown is very complicated, and necessitates the employment 0 of two threaded connections, and the wedgebearing is limited. In myin vention the wedgebearing is such that the single screw will hold the knob very rigid, while the limited bearings mentioned are liable to a slight play.

The device is simple, efficient, and convenient.

Having thus fully described my invention, what I claim is- The knob-shank 0, having one internal side 10c inclined, as at c, and inclined seats 0 and the In testimony whereof I affix my signature in knob D, having a central countersunk aperpresence of two witnesses. ture, d, and inclined surfaces (1, to correspond with the seats 0 combined with the wedge F, GEORGE HATHAWVAY' having perforated arm F, and the screw E, Witnesses:

adapted to serve with the spindle A, as and J. R. NOTTINGHAM,

for the purposes specified. WILLIAM FITCH. 

